I certainly don't think it is pointless, but I'm really not sure what it will achieve other than debasing his celebrity life to that reserved for the likes of Gary Glitter - to never be spoken of in kind again. But the Louis Theroux programme pretty much settled my opinion of JS being a distasteful egocentric boor.
For the victims, this will not achieve closure. Living with child abuse for how ever many years never goes away - even if the perpetrator is imprisoned, or dead. I know they had their reasons (shame etc) but why those 14 year old victims didn't (or felt they couldn't) speak out when they were 24, 34, 44 or 54 is a tragedy for subsequent victims.
One terrible fact is that so many kept it quiet for so long, and that this led to more and more victims over time. Yes lessons migh be learnt, but its too late.